no-compare-against-boolean-literals
Checks that boolean expressions do not compare against literal values
of true or false. This is to prevent overly verbose code such as
if (isEnabled == true) when if (isEnabled) would suffice.
Examples of incorrect code for this rule:
if (foo == true) {}
if (foo != false) {}
if (false == foo) {}
Examples of correct code for this rule:
      if (!foo) {}
if (!!foo) {}